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Does SO21 flood?

Yes — parts of the SO21 district carry real flood risk: 20 of its 48 at-risk postcodes reach the Environment Agency's High likelihood band. The SO21 postcode district covers Badger Farm and Oliver's Battery, Wonston and Micheldever, Colden Common and Twyford, Alresford and Itchen Valley, close to Winchester, Easton, Itchen Stoke, and surrounding villages in Hampshire.

48 postcodes in the SO21 district appear in the Environment Agency's rivers-and-sea flood-risk dataset — worst bands: 20 high, 8 medium, 10 low, 10 very low. A postcode not listed here has no properties in any recorded risk band (which is good news, but never proof it cannot flood).

Free preview first · full report £19

Which SO21 postcodes are at risk?

SO21 1BQ up to High SO21 1BZ up to High SO21 1DA up to High SO21 1DB up to High SO21 1DF up to High SO21 1EH up to High SO21 1NT up to High SO21 1QF up to High SO21 1TL up to High SO21 2BP up to High SO21 2EE up to High SO21 2EF up to High SO21 2EL up to High SO21 3BW up to High SO21 3DD up to High SO21 3DF up to High SO21 3DT up to High SO21 3FR up to High SO21 3QJ up to High SO21 3RH up to High SO21 2EQ up to Medium SO21 3DB up to Medium SO21 3GX up to Medium SO21 3JG up to Medium SO21 3JH up to Medium SO21 3JJ up to Medium SO21 3RA up to Medium SO21 3SF up to Medium SO21 1EB up to Low SO21 1QE up to Low SO21 1QJ up to Low SO21 2DU up to Low SO21 2HE up to Low SO21 2LF up to Low SO21 3LA up to Low SO21 3LD up to Low SO21 3PF up to Low SO21 3RR up to Low SO21 1TQ up to Very low SO21 1UU up to Very low SO21 1UW up to Very low SO21 1UX up to Very low SO21 1WP up to Very low SO21 2EG up to Very low SO21 2EP up to Very low SO21 2ES up to Very low SO21 2EU up to Very low SO21 2FB up to Very low

Rivers and flooding history near SO21

The rivers that matter here, each monitored live on FloodRadar:

206 official flood warnings and alerts have been raised within ~10 km of the district's centre since 2006 (29 at warning level or above), most recently 30 March 2026. Warnings cover flood areas, not individual addresses.

Recorded flood extents near the district (Environment Agency record):

Records, not floods: no outline on the record is not evidence a place has not flooded.

🏠 Buying or renting in SO21? The full property flood-risk report covers any postcode here — the official likelihood band, every recorded flood nearby with distances, warning history year by year, how the local rivers behave, and an insurance outlook, print-ready for £19. See what's in the report →

Flood risk in nearby postcode districts

SO20 SO22 SO19 SO23 SO18 SO24 SO17 SO16

Band = the worst likelihood band of any property in that postcode (EA Risk of Flooding from Rivers & Sea, defence-adjusted, area-level). Check any postcode in detail — or get the full £19 property report — at the property flood-risk report. © Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064.